DE1563752A1 - Speed controller for motors - Google Patents

Description

The invention relates to regulators for controlling or regulating the speed, of small electric motors, e.g. motors for electric sewing machines.

These controls are usually foot operated devices, either by a small button or operated by a hinged plate element which corresponds approximately to the width of the foot. In this known training they require the absence of a preceding one Drive part the exact arrangement of the foot, whereby the operator is somewhat distracted, his attention mainly for working on the needle is required.

Therefore, it is an object of the invention to provide a To create foot controllers or foot regulators that one through the foot-operated drive part has such a shape and size,

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that it predominates over a maximum width or length of the exposed surface of the device for the foot Available.

Another object of the invention is to provide a foot controller that is positioned along the length of the operator zugewani, I ü leading edge a minimal vertical Height has to allow comfortable engagement of the actuator with the foot in the naturally raised toe and heel pivot position to effect

Another object of the invention is to provide a foot controller in the shape of a generally rectangular Box base in conjunction with a hinged control cover or control cover to create the is arranged above the lower part and shifts or moves relative to the box and its longitudinal dimension runs parallel to the pivot axis.

Another object of the invention is to create a foot controller with a predominantly exposed actuating part, which has simple means, and which can be conveniently attached in order to push the actuating part into an initial position and to adjust it.

In the following description, an embodiment of the invention is explained in conjunction with the drawing, this embodiment, however, only serves to illustrate the invention, to which the invention does not relate.

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restricts 1st

Figures 1 and 2 are respectively a plan view and a side view of one according to the invention trained controller or regulator. Fig. 3 is a plan view on an enlarged scale of the controller of Figures 1 and 2, in which the cover is pivoted to the to expose components enclosed in the controller.

Fig. 4 is a longitudinal section along line 4-4 of Figs. 3 * with the cover in its normal working position is arranged.

Figures 5 and 6 are cross-sectional views according to FIG lines 5-5 and 6-6 of Figure 3 with the cover in its normal working position is.

According to Figures 1 and 2 has a according to the invention Manufactured controller has a housing that has a hollow cover or contains a pedal Io which, along its rear edge, is connected to the rear edge of a hollow lower part 11 pivotally connected by a pair of spaced apart hinges 12 (Fig. 3). The cover and the base lls are made of a substantially rigid non-conductive material, e.g. a synthetic resin, and are preferably molded or injected to provide various airfoils, recesses and protrusions

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or to create approaches such as those for adding or installing various parts and mechanisms for converting the movement the cover Io around the axis 15 of the hinges 12 in resistance changes are required for the Regulation of the speed of the motor are necessary.

These internal structures and mechanisms which do not form part of the invention are in a different application shown.

For the purpose of explaining the invention it suffices to say that the cover Io has a generally rectangular shape in plan view and that its long dimension is parallel to the hinge axis 1J> , and this size is preferably at least one and a half times the transverse dimension. The actual length along the hinge axis can be on the order of twice the width of an ordinary shoe. This size ratio provides ease of use and considerable freedom in locating the foot in one of several good working positions. In short, an actuating part dimensioned in this way is not critical for the position of the foot.

It will also be seen that the cover is expediently designed so that it protrudes large exposed area, and on both sides 14 and 15 both as well as along the front edge 16 over the lower part Io protrudes. The top surface is curved downwardly concave against the leading edge 16 to a minimum vertical height

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to create along this leading edge. This will make the Increases likelihood that the foot will pass through when testing Touching the controller usually comes in contact with the cover or the lid, what a quick real thing Arrangement is desired.

As best shown in Figure 6, are springs 17 pressed over protruding lugs 18 on the inner surface of the cover Io. The dimensions of the springs 17 are such that they hold themselves in place by contracting helically around the lugs 18 and are therefore self-locking. When the lid Io by pivoting around the hinge axis 1? is closed, the Springs 17 are guided onto their flat seats 19 through the sides of conical recesses 2o, which in the lower part 11 are trained.

The springs 17 create a compressive force around the lid Io in its initial rest position or ineffective position when the operator's foot is removed from the lid Io. This initial position of the lid Io can be adjusted and fixed by a screw fastener 21 with self-locking, which is threaded into a Insert 22 engages in the lid Io, and has a head, with a cup-shaped disc 23 in engagement which is removably arranged in an opening 24 in the lower part 11 (FIG. 5). The screw fastening 21 can be adjusted with a screwdriver

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a slot 25 are detected, which is formed in an elastic friction pad 26, which is on the lower surface of the lower part 11 is attached. The screw fastener 21 is in a holding position within the recess 24 retained even when unscrewed from the insert 22 should be. However, in a preferred embodiment of this device, the slot 25 can be omitted to create a foolproof education. In this case, the screw fastening is adjusted 21 in the factory before attaching the unperforated pad or cushion 26 to the lower part 11, which then also serves to prevent a subsequent Eale setting compared to the setting in the factory.

When the cover Io is pressed down against the force of the springs 17, the protruding sides slide 14 and 15 of the cover Io opposite the corresponding sides 27 and 28 of the lower part 11. It also moves a rib 29 formed on the inner surface of the cover or lid Io opposite to a rib 5o, which is formed on the lower part 11. These sliding parts create security against unintentional access by an operator into the interior of the controller containing energized electrical elements, and further At the same time, these parts create sufficient access for purging air, which flows to the area in the resistance element to distribute generated heat.

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A downward end position of the lid Io occurs, when the rib 29 comes into contact with the lower part 11.

From the above it can be seen that According to the invention there is provided a foot controller having a protruding exposed actuating portion in the form a hinged sliding cover with which the foot can quickly and easily engage and with which simple but effective means are provided to the lid or the cover in an initial rest position to press and set.

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Claims (4)

I S / VJ «4 f vj £, Claims. 1 · Speed controller for electric motor rait a generally rectangular base, a rectangular cover hinged to and across the base the base protrudes to form a large exposed cover surface, characterized in that the pivot axis (13) lengthways, the rear edge of the cover (lo) extends in the direction of its larger rectangular dimension, and that the cover (lo) is shaped on the outside so that it opposite and parallel to the hinge axis (IJ) downwards is curved concave towards the leading edge (l6) to a minimum perpendicular height of the controller along the leading edge (16) to create. 2. Speed controller according to claim 1, characterized in that a suspension (17) between the lower part (11) and cover (lo) is provided, which presses the cover (lo) upwards. 3. Speed controller according to one of the claims 1 or 2, characterized in that the suspension is a helical suspension which is self-locking on its carrier (18) sits. 4. Speed controller according to one of the claims 1 to 3, characterized in that in the lower part (11) Upwardly widening guides (2o) are provided for the suspension (17). 00 9 B 1 6 / ü 1 54 5 · Speed controller according to one of the claims 1 to 4, characterized in that on the cover (lo) an adjusting part (21) is provided which determines the upper rest position of the cover (lo). 6 · Speed controls according to one of Claims 1 to 5, » characterized« in that the adjusting means (21) is a screw (21) inserted into the underside of the cover (lo), the head of which cooperates with an abutment in the lower part (11) 7 «Speed controller · according to one of claims 1 to 6, characterized in that a socket-shaped abutment (25) through which the screw shaft is passed is inserted into a recess (24) in the lower part (11). ORIGINAL. Jfc53? 5CTED 009818/0154